This compound is a benzo-substituted 18-crown-6 ether derivative featuring an ethynyl group at position 18. It serves as a versatile intermediate in supramolecular chemistry, leveraging the crown ether moiety for selective complexation and binding of metal cations such as potassium and sodium ions. The terminal alkyne functionality enables efficient participation in click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloadditions (CuAAC), under mild conditions to construct diverse molecular conjugates. Applications include the development of ion-selective sensors, phase-transfer catalysts, and functionalized nanomaterials for drug delivery and biological imaging.